Multiple zone mining plus beneficiation of western phosphate rock :a cost estimate and comparison with selective mining

Author: Spencer, Richard N.
Year: 1971
Document Type: BMRA
Issuing Agency: U.S. Dept. of Interior, Bureau of Mines,
SUDOC: I 28.23:7512
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 7512
Subjects: Ore-dressing--Costs
Phosphate mines and mining--Costs
Link: https://hdl.handle.net/2027/mdp.39015078477992

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